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This paper will describe an easy method to analyze performance of various power MOSFETs in step down switching regulators using the PSPICE circuit analysis tool. A comparison will be made between circuit simulation results and the measured performance described in Motorola Application Note AN1520.
The utility of having a model which closely simulates switching performance is that different MOSFETs and diodes can be used in the model and comparisons can be made for proper performance vs. price, size, etc. prior to building breadboards.
Actual hardware should always be used to verify performance, but a good simulation model gives the designer a means of trying various combinations of parts quickly to see how well they work in a particular circuit.
The Motorola semiconductor components website has SPICE, PSPICE, HSPICE, and Saber models available to download for numerous n–channel and p–channel MOSFETs along with several power rectifiers. Application Note AN1520 [1] can be found at www.mot–sps.com/books/apnotes.
It should be noted that a full version of PSPICE is needed to run these simulations, the numerous demo versions do not support the complexity of the MOSFET models. A copy of the PSPICE circuit model listing is included for reference.
